diff --git a/Algorithms/Easy/2309_GreatestEnglishLetterInUpperAndLowerCase/solution.cpp b/Algorithms/Easy/2309_GreatestEnglishLetterInUpperAndLowerCase/solution.cpp
new file mode 100644
index 0000000..2feb224
--- /dev/null
+++ b/Algorithms/Easy/2309_GreatestEnglishLetterInUpperAndLowerCase/solution.cpp
@@ -0,0 +1,35 @@
+class Solution {
+public:
+    string greatestLetter(string s) {
+        
+        int up[26]={0};
+        int low[26]={0};
+        int temp;
+        char c;
+        
+        for (int i=0;i<s.length();i++)
+        {
+            if (s[i]>=97)
+            {
+                low[s[i]-'a']++;
+            }
+            else
+            {
+                up[s[i]-'A']++;
+            }
+        }
+        string ans;
+        for (int i=25;i>=0;i--)
+        {
+            if(low[i]!=0 && up[i]!=0)
+            {
+                ans=i+'A';
+                break;
+            }
+        }
+        
+        return ans;
+        
+        
+    }
+};