2443. sunny的烦恼

int f(int n) {
    if (n < 10) {
        return n;
    } 
    return f((n % 10) + f(n / 10));
}

for _ in range(int(input())):
    n = int(input())
    print((n-1) % 9+1 if n else 0)

    cin>>num;
    total = num;
    while(total>=10){
        total = 0;
        while(num){
            total += num%10;
            num /= 10;
        }
        num = total;
    }


    cout<<total<<endl;
}
return 0;