noname37

#include<bits/stdc++.h>
#include<conio.h>
#define sz(x) x.size()
using namespace std;
string n;
int main(){
    while(true){
        system("cls");
        cout << "Enter your name: "; cin >> n;
        bool flag = 1; int l=sz(n);
        for(int j=0; j!=l; j++){
            char i=n[j];
            if(i<' ' || (i>' '&&i<'A') || (i>'Z'&&i<'a') || (i>'z')){
                flag = 0; break;
            }
        }
        if(flag) break;
        else{
            cout << "Invalid name inputted. Please try again!";
            getch();
        }
    }
    cout<<"OK!";
}