const row = require('fs').readFileSync('/dev/stdin','utf8').split('\n');
const numbers = [];
let numberFlg = false;
const column = row[0].split('').map(e => {
    if(/\d/.test(e)) {
        numbers.push(Number(e));
        numberFlg = true;
    }
    return undefined;
});

let result = 0
if(numberFlg) {
    result = numbers.reduce((acc,cur) => {
        return acc + cur;
    });
}

console.log(result);