题解

#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,len;
    string a;
    cin>>n;
    while(n--){
        cin>>a;
        len = a.length();
        for(int i=0,f=1;i<len;i++){
            if(f)
                if('a'<=a[i]&&a[i]<='z' || 'A'<=a[i]&&a[i]<='Z'){
					f=0;
                    if('a'<=a[i]&&a[i]<='z')
                        a[i]-=32;
                    cout<<a[i];
                }else{
                    cout<<a[i];
                }
            else{
                if('A'<=a[i]&&a[i]<='Z')
                    a[i]+=32;
               	cout<<a[i];
            }
        }
        cout<<endl;
    }
    return 0;
}