diff --git a/FCC/Day22/nikitin2009.js b/FCC/Day22/nikitin2009.js
new file mode 100644
index 0000000..1fd0daa
--- /dev/null
+++ b/FCC/Day22/nikitin2009.js
@@ -0,0 +1,27 @@
+function pair(str) {
+  
+  var arr = str.split(''),
+      newarr = [];
+  
+  for (var i = 0; i < arr.length; i++) {
+    switch (arr[i]) {
+      case 'A':
+        newarr[i] = ['A', 'T'];
+        break;
+        
+      case 'T':
+        newarr[i] = ['T', 'A'];
+        break;
+        
+      case 'C':
+        newarr[i] = ['C', 'G'];
+        break;
+        
+      case 'G':
+        newarr[i] = ['G', 'C'];
+        break;
+    }
+  }
+  
+  return newarr;
+}