const char *compare_string(int type=1) {
    switch (type)
    {
    case(1):
        return "qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM ";
    case(2):
        return "    qwertyuiopasdfghjklzxcvbnm,.?!-@QWERTYUIOPASDFGHJKLZXCVBNM ";
    case(3):
        return "    qwertyuiopasdfghjklzxcvbnm,.?!-@QWERTYUIOPASDFGHJKLZXCVBNM 1234567890";
    }
}

bool check_string(const char *S, int typet=1) {
    if (typet < 4) {
        const char *temp = compare_string(typet);
        unsigned point_count = 0;

        for (int i = 0; i < strlen(S); i++) {
            if (!strchr(temp, S[i]))
                //return check_string(S, typet+1);
                return false;
        }
        return true;
    }
    //else {
    //  return false;
    //}
}

char *getstring() {
    const int N = 1000;
    char S[N];
    if (cin.peek() == '\n') cin.ignore(100, '\n');
    cin.getline(S, N);
    bool inpOk = false;
    while (!inpOk) {
        if (!check_string(S)) {
            cerr << "Invalid input. Try again." << endl;
            cin.getline(S, N);
        }
        else
            inpOk = true;
    }
    return S;
}
int main(){
//setlocale(LC_ALL, "");
char *s = getstring();
printf("%s", &s);
return 0;
}
//input CPP
//output o'