#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>

int main(){
    int n,count=0; 
    scanf("%d",&n);
    int *height = malloc(sizeof(int) * n);
    for(int height_i = 0; height_i < n; height_i++){
       scanf("%d",&height[height_i]);
        if(height[height_i]>height_i)
            {
            while(n!=0)
                {
                n/=10;
                ++count;
            }
            
            printf("%d",++count);
            
        }
        
    }
    return 0;
}