var allWishes = document.getElementsByClassName("wishAndLink");
var validWishes = [];
for(var wish of allWishes){
    if(wish.children[0].children[2].value != ""){
        validWishes.push(wish);
    }
}

var i = 1;
for(var wish of validWishes){
    wish.children[3].value = i;
    i++;
}