#include <stdio.h>int main( void ){
    int l = 0;
do{    int a,b;    scanf( "%d %d",&a,&b );      a = a + b;       int n = 1;      int j = 0;      while( true ){            if( a / n >= 1 ) n *= 10;            else               break;          j++;          }      printf( "%d",j ); }while( l < 200;l++ );    return 0;}