题解

#include<iostream>
#include<cstring>
using namespace std;
int main(){
    int n;
    cin>>n;
    char s[21];
    for(int i=1;i<=n;i++){
    	cin>>s;
        for(int i=1;i<strlen(s);i++){
            if('A'<=s[i]&&s[i]<='Z') s[i]+=32;
        }
        if('a'<=s[0]&&s[0]<='z') s[0]-=32;
        cout<<s<<endl;
    }
    return 0;
}