diff --git a/1903-20231207-pass/main.cpp b/1903-20231207-pass/main.cpp
new file mode 100644
index 0000000..4df9cca
--- /dev/null
+++ b/1903-20231207-pass/main.cpp
@@ -0,0 +1,22 @@
+#include<stdcpp.h>
+using namespace std;
+class Solution{
+public:
+    string largestOddNumber(string num){
+        string rlt = "";
+        for(int i = num.size() - 1 ; i >= 0 ; i--){
+            if(num[i]=='1' || num[i] == '3' || num[i] == '5' || num[i] == '7' || num[i] == '9'){
+                rlt = num.substr(0,i+1);
+                break;
+            }
+        }
+        return rlt;
+    }
+};
+int main(){
+    Solution sol;
+    cout<<sol.largestOddNumber("52")<<endl;
+    cout<<sol.largestOddNumber("2480")<<endl;
+    cout<<sol.largestOddNumber("35247")<<endl;
+    return 0; 
+}
\ No newline at end of file