process.stdin.resume();
process.stdin.setEncoding('utf8');

process.stdin.on('data', function (chunk) {
    const n = chunk.toString();
    const r = n.split("\n").filter(x => x != 0);
    r.forEach(x => sp(x));
});

function sp(rep){
    const x = rep.split("").map(x => Number(x));
    var acc = 0;
    if(x.length===1){
        return console.log(x[0]);
    }

    for(var i=0; i<x.length; i++){
        acc += x[i];
    }
    console.log(acc);
}
