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

function Main(input) {
    var str;
    var sum = 0;
    for (i = 0; i < input.length; i++) {
        str = input.charAt(i)
        if (str.charCodeAt() >= 48 && str.charCodeAt() <= 58) {
            sum += parseInt(str);
        }
    }
     console.log(sum);
}