var input = require('fs').readFileSync('/dev/stdin', 'utf8');
var lines = input.split('\n');

for (var i = 0; i < lines.length; i++) {
	if (lines[i] == '') break;
	var vals = lines[i].split(' ').map(function(i){return +i;});
	var a = vals[0] + vals[1];
	var str = a + '';
	console.log(str.length);
}