[Laboratoriski]Paren Ekvivalent

#include <stdio.h>

int main() {

    int a,b, flag = 0;
    scanf("%d %d", &a, &b);

    if (a <= 0 || b <= 0) {
        printf("Invalid input\n");
    } else {
        int tmp = a;
        if (a < b) {
            tmp = a;
            a = b;
            b = tmp;
        }
        a/=10;
        while (b && a) {
            if (a%10 == b%10) {
                b/=10;
                if (!b) {
                    flag = 1;
                }
            }
            a/=100;
        }

        if(flag) {
            printf("PAREN!\n");
        } else {
            printf("NE!\n");
        }
    }

    return 0;
}