otstou

var input = "javascript is awesome";
var output = "";
for (var i = 0;i< input.length;i++){if(input[i]==="a") {output+="4"}
else if(input[i]==="e") {output+="3"}
else if(input[i]==="i") {output+="1"}
else if(input[i]==="o") {output+="0"}
else{output += input[i]}}
console.log(output);