ACAC

#include <bits/stdc++.h>
using namespace std;
void Aa(char &x){
    if(x >= 'A' and x <= 'Z'){
        x += 32;
    }else if(x >= 'a' and x <= 'z'){
        x -= 32;
    }
}
int main(){
    int a;
    string s;
    cin >> a;
    while(a--){
        cin >> s;
        int len = s.size();
        for(int i = 0; i < len; i++){
            if(i == 0 and s[i] >= 'a' and s[i] <= 'z'){
                Aa(s[i]);
            }else if(i != 0 and s[i] >= 'A' and s[i] <= 'Z'){
                Aa(s[i]);
            }
        }
        cout << s << endl;
    }
    return 0;
}