Парен еквивалент

#include <stdio.h>

int main()
{
    int a, b, tmp, cifra_a, cifra_b, found = 1;
    scanf("%d %d", &a, &b);

    if(a <= 0 || b <= 0)
    {
        printf("Invalid input");
    } else {

       if(a < b) {
           tmp = a;
           a = b;
           b = tmp;
       }

       while(a > 0&&b > 0)
       {
           a /= 10;
           cifra_a = a % 10;
           a /= 10;
           cifra_b = b % 10;
           b /= 10;

           if(cifra_a != cifra_b) {
                found = 0;
                break;
           }
       }
       if(found == 0)
        printf("NE");
       else
        printf("PAREN");

    }

    return 0;
}