function Main(input) {
    input = input.split("\n");
    input.push("EOF");
    for(var i=0;input[i]!="EOF";i++){
    	if(input[i].length>2){
    		num = input[i].split(" ");
    		console.log(Str(Int(num[0])+Int(num[1])).length);
    	}
    }
}
//??°????????????????????¢??°??¨(??????)
function ascendingOrder(val1,val2){
    return val1 - val2;
}
//??°????????????????????¢??°??¨(??????)
function descendingOrder(val1,val2){
    return val2 - val1;
}
//??°??????
function Int(str){
    return parseInt(str, 10);
}
//????????????
function Str(num){
    return num.toString(10);
}


//???????????°??¨
function debug(){
	var input = document.getElementById("input").value;
	Main(input);
}

//?????????????????\??????????????????
Main(require("fs").readFileSync("/dev/stdin", "utf8"));