#include <stdio.h>
int main()
{
    int n=0,i,dem=0;
    while (n<=0)
    {
        printf("Vui long nhap n:");
        scanf("%d",&n);
    }
    while (n>10)
    {
        n=n/10;
       dem=dem +1;
       
    }
    printf("So luong cac chu so la:%d",dem+1);
    return 1;
}