1 import java.io.BufferedReader; 2 import java.io.IOException; 3 import java.io.InputStreamReader; 4  5 public class Main { 6      7     public static void main(String[] args) throws NumberFormatException, IOException { 8          9         BufferedReader reader=new BufferedReader(new InputStreamReader(System.in));10         11         boolean first=true;12         while(first || reader.ready()){13             first=false;14             String ss[]=reader.readLine().split(" ");15             int a=Integer.parseInt(ss[0]);16             int b=Integer.parseInt(ss[1]);17             if(a==0 && b==0) return ;18             System.out.println(solve(a,b));19         }20         21     }22     23     public static int solve(int a,int b){24         int res=0; boolean carry=false;25         while(a>0 && b>0){26             int t1=a%10;27             int t2=b%10;28             if(t1+t2+(carry?1:0)>=10){29                 res++;30                 carry=true;31             }else{32                 carry=false;33             }34             a/=10;35             b/=10;36         }37         return res;38     }39 40 }