function div(a, b){
    return Math.floor(a/b)
}

function roundDown(a){
    var d = 1;
    while(d <= a){
        d *= 10;
    }
    return d/10;
}

function merge(a, b){
    var r = 0,
        da = roundDown(a),
        db = roundDown(b);
    while(da >= 1 && db >= 1){
        r = 100*r + 10 * div(a, da) + div(b, db);
        a = a % da;
        b = b % db;
        da /= 10;
        db /= 10;
    }
    if(a > 0 || b > 0){
        r = r*Math.max(da, db)*10 + Math.max(a, b);
    }
    return r;
}