const row = require('fs').readFileSync('/dev/stdin','utf8').split('\n');
const str = row[0].split('');

const num = str.filter(e => {
    return /\d/.test(e);
}).map(e => {
    return Number(e);
})

let result = 0;
if(num.length > 0){
    result = num.reduce((acc, cur) => {
      return acc + cur;
    })
}
console.log(result);