function Main(input) {
	input = input.split("\n");
	var str = input[0];
	res = 0;
	for (var i = 0; i < str.length; i++){
		if (isNaN(str[i])){
			continue;
		}else{
			res += Number(str[i]);
		}
	}
	console.log("%d", res);
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));