#include <stdio.h>


int difference(int a,int b){
    int x=0,result,y;
    if(a<b)
        result=b-a;
    else
        result=a-b;
    x=10-80;
    y=x-50;
    return result; // return 을 빼먹으면 어떤일이 벌어질까?
}

int main() {
    int a,b,i;

    printf("write two numbers: \n");

    for(i=0; i<5; i++){
        scanf("%d,%d",&a, &b); 
        printf("the difference of the two numbers: %d\n", difference(a,b)); 
    }
    
    //scanf("%d,%d",&a, &b); 
    //printf("the difference of the two numbers: %d", difference(a,b));
    return 0;
}