diff --git a/125_valid_palindrome/main.cpp b/125_valid_palindrome/main.cpp
new file mode 100644
index 0000000..f6f9ca7
--- /dev/null
+++ b/125_valid_palindrome/main.cpp
@@ -0,0 +1,28 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+class Solution {
+   public:
+    bool isPalindrome(string s) {
+        string proceededStr;
+
+        for (auto ch : s) {
+            if ((ch >= 'a' && ch <= 'z') || (ch >= '0' && ch <= '9')) {
+                proceededStr.push_back(ch);
+            } else if (ch >= 'A' && ch <= 'Z') {
+                proceededStr.push_back(ch - ('A' - 'a'));
+            }
+        }
+
+        cout << proceededStr << "\n";
+
+        const int len = proceededStr.length();
+        for (int i = 0; i < len / 2; i++) {
+            if (proceededStr[i] != proceededStr[len - i - 1]) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+};