#include <stdio.h>
#include <conio.h>
int sum(int x,int y);
int main(){
int a,b,s;
printf("please input:");
scanf("%d,%d",&a,&b);
s=sum(a,b);
getch();
return 0;
}
int sum(int x,int y){
 int z;
 z=x+y;
 printf("z=%d",z);
 return z;
}