varianta cu while

#include <iostream>

using namespace std;

int main()
{
    char numar[30];
   cin >> numar;
    if(!numar[1]){
        return 0 ;
    }
    int i = 0;
    while(numar[i+1] && numar[i] < numar[i + 1]){
      ++i;
    }
  numar[i] = '\0';
  cout << numar << numar + i + 1;


    return 0;
}