#include <bits/stdc++.h> using namespace std; string s; int n; int main(){ getline(cin, s); for (int i = 1; i <= n; i++){ cin >> s; if (s[0] >= 'a' && s[0] <= 'z'){ s[0] -= 32; } else if (s[i] >= 'A' && s[i] <= 'Z'){ s[i] += 32; } cout << s << endl; } return 0; } //错误的题解！！！😂