class Main
{
	public static void main( String[] args )
	{
		java.util.Scanner sc = new java.util.Scanner( System.in );
		int sum;
		int digitNum = 0;
		
		while( sc.hasNext() )
		{
			sum = sc.nextInt() +  sc.nextInt();
			
			digitNum = 0;
			while( sum > 0 )
			{
				sum /= 10;
				digitNum++;
			}
			System.out.println( digitNum );
		}
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz