# include<stdio.h> //编译预处理指令
int main(){ //定义主函数int max (int x,int y);int a,b ,m;   scanf("%d,%d",&a,&b);m = max( a,  b);printf("max is %d \n ",m);return 0 ;}
int max(int x,int y){int c ;if (x>y){c=x;}else{c= y;}return c;}