Problem:
Digit Number

Write a program which computes the digit number of sum of two integers a and b.

Input

There are several test cases. Each test case consists of two non-negative integers a and b which are separeted by a space in a line. The input terminates with EOF.

Constraints

0 ≤ a, b ≤ 1,000,000

The number of datasets ≤ 200

Output

Print the number of digits of a + b for each data set.

Sample Input

5 7
1 99
1000 999

Output for the Sample Input

2
3
4

Solution in C# (judge verdict: Compile Error)

#include<stdio.h>
#include<math.h>
int main(void)
{
    int a,b;
    int c;
    scanf("%d %d",&a,&b);
    c = a + b;
    c = log10(c);
    printf("%d\n",c+1);
    return 0;
}