#include <stdio.h>
int main(){
int n, i=0;
printf(" Nhap vao so nguyen duong n:");
scanf("%d", &n);
int SoBanDau=n;
while(n>0){
i++;
n/=10;
}
printf(" So %d có %d chu so.\n", SoBanDau,i);
	return 0;
}