diff --git a/packages/contracts/flow/contracts/SakutaroPoem.cdc b/packages/contracts/flow/contracts/SakutaroPoem.cdc
index 96266c6..edead6e 100644
--- a/packages/contracts/flow/contracts/SakutaroPoem.cdc
+++ b/packages/contracts/flow/contracts/SakutaroPoem.cdc
@@ -122,6 +122,7 @@ access(all) contract SakutaroPoem: NonFungibleToken {
     access(all) resource interface SakutaroPoemCollectionPublic {
         access(all) fun deposit(token: @{NonFungibleToken.NFT})
         access(all) view fun getIDs(): [UInt64]
+        access(all) view fun getLength(): Int
         access(all) view fun borrowNFT(_ id: UInt64): &{NonFungibleToken.NFT}?
         access(all) view fun borrowPoem(_ id: UInt64): &SakutaroPoem.NFT? {
             post {
@@ -164,6 +165,10 @@ access(all) contract SakutaroPoem: NonFungibleToken {
             return self.ownedNFTs.keys
         }
 
+        access(all) view fun getLength(): Int {
+            return self.ownedNFTs.length
+        }
+
         access(all) view fun borrowNFT(_ id: UInt64): &{NonFungibleToken.NFT}? {
             return &self.ownedNFTs[id] as &{NonFungibleToken.NFT}?
         }
diff --git a/packages/contracts/flow/contracts/SakutaroPoemReplica.cdc b/packages/contracts/flow/contracts/SakutaroPoemReplica.cdc
index a2005cc..528a4b2 100644
--- a/packages/contracts/flow/contracts/SakutaroPoemReplica.cdc
+++ b/packages/contracts/flow/contracts/SakutaroPoemReplica.cdc
@@ -71,6 +71,7 @@ access(all) contract SakutaroPoemReplica: NonFungibleToken {
     access(all) resource interface SakutaroPoemReplicaCollectionPublic {
         access(all) fun deposit(token: @{NonFungibleToken.NFT})
         access(all) view fun getIDs(): [UInt64]
+        access(all) view fun getLength(): Int
         access(all) view fun borrowNFT(_ id: UInt64): &{NonFungibleToken.NFT}?
         access(all) view fun borrowPoem(_ id: UInt64): &SakutaroPoemReplica.NFT? {
             post {
@@ -113,6 +114,10 @@ access(all) contract SakutaroPoemReplica: NonFungibleToken {
             return self.ownedNFTs.keys
         }
 
+        access(all) view fun getLength(): Int {
+            return self.ownedNFTs.length
+        }
+
         access(all) view fun borrowNFT(_ id: UInt64): &{NonFungibleToken.NFT}? {
             return &self.ownedNFTs[id] as &{NonFungibleToken.NFT}?
         }
diff --git a/packages/contracts/flow/flow.json b/packages/contracts/flow/flow.json
index 06d7c97..a1d5d77 100644
--- a/packages/contracts/flow/flow.json
+++ b/packages/contracts/flow/flow.json
@@ -6,9 +6,30 @@
     }
   },
   "contracts": {
-    "NonFungibleToken": "./contracts/core/NonFungibleToken.cdc",
-    "ViewResolver": "./contracts/core/ViewResolver.cdc",
-    "MetadataViews": "./contracts/core/MetadataViews.cdc",
+    "NonFungibleToken": {
+      "source": "./contracts/core/NonFungibleToken.cdc",
+      "aliases": {
+        "emulator": "f8d6e0586b0a20c7",
+        "mainnet": "1d7e57aa55817448",
+        "testnet": "631e88ae7f1d7c20"
+      }
+    },
+    "ViewResolver": {
+      "source": "./contracts/core/ViewResolver.cdc",
+      "aliases": {
+        "emulator": "f8d6e0586b0a20c7",
+        "mainnet": "1d7e57aa55817448",
+        "testnet": "631e88ae7f1d7c20"
+      }
+    },
+    "MetadataViews": {
+      "source": "./contracts/core/MetadataViews.cdc",
+      "aliases": {
+        "emulator": "f8d6e0586b0a20c7",
+        "mainnet": "1d7e57aa55817448",
+        "testnet": "631e88ae7f1d7c20"
+      }
+    },
     "Base64Util": "./contracts/Base64Util.cdc",
     "SakutaroPoem": "./contracts/SakutaroPoem.cdc",
     "SakutaroPoemReplica": "./contracts/SakutaroPoemReplica.cdc",
@@ -55,15 +76,7 @@
   },
   "deployments": {
     "emulator": {
-      "emulator-account": [
-        "NonFungibleToken",
-        "ViewResolver",
-        "MetadataViews",
-        "Base64Util",
-        "SakutaroPoem",
-        "SakutaroPoemReplica",
-        "SakutaroPoemContent"
-      ]
+      "emulator-account": ["Base64Util", "SakutaroPoem", "SakutaroPoemReplica", "SakutaroPoemContent"]
     },
     "testnet": {
       "testnet-account": ["Base64Util", "SakutaroPoem", "SakutaroPoemReplica", "SakutaroPoemContent"]