#include<iostream>
#include<algorithm>
using namespace std;
int main(){ 
	char c; int a,b;
	scanf("%c%c%d%c%c%c%d%c%c%c%c%c",&c,&c,&a,&c,&c,&c,&b,&c,&c,&c,&c,&c);
	//cout<<a<<" "<<b<<" ";
	cout<<a+b;
	return 0;
}