diff --git a/131A cAPS lOCK/131A.cpp b/131A cAPS lOCK/131A.cpp
new file mode 100644
index 0000000..f22c762
--- /dev/null
+++ b/131A cAPS lOCK/131A.cpp	
@@ -0,0 +1,40 @@
+#include <bits/stdc++.h>
+using namespace std;
+using ll = long long;
+
+void solve()
+{
+    string s;
+    cin >> s;
+    bool cap = 1;
+    for (int i = 1; i < s.size(); ++i)
+    {
+        if (islower(s[i]))
+        {
+            cap = 0;
+            break;
+        }
+    }
+    if (cap)
+    {
+        for (int i = 0; i < s.size(); ++i)
+        {
+            if(islower(s[i])) 
+                s[i]=toupper(s[i]);
+            else s[i]=tolower(s[i]);
+        }
+    }
+    cout<<s<<endl;
+}
+
+int main()
+{
+    ios_base::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    int TC = 1;
+    // cin >> TC;
+    // cin.ignore();
+    while (TC--)
+        solve();
+}
\ No newline at end of file