var os = require('os');
function func(line) {
    var nums = line.split(' ');
    var a = parseInt(nums[0]) + parseInt(nums[1]);
    results.push(a.toString().length);
}
 
var results = [];
var input = '';
 
 
process.stdin.setEncoding('utf8');
process.stdin.on('data', function(data) {
  input += data;
  var index = input.indexOf(os.EOL);
  while(index > -1){
    var line = input.substring(0, index);
    input = input.substring(index + 1);
    func(line);
    index = input.indexOf(os.EOL);
  }
});
process.stdin.on('end', function(data) {
    if(input.length > 0){
        func(input);
    }
  var output = results.join(os.EOL) + os.EOL;
  process.stdout.write(output);
});
process.stdin.resume();