P55722_en/S001-AC.cc

#include <iostream>
using namespace std;
int number_of_digits(int n)
{
	int res = 0;
	do
	{
		n /= 10;
		res++;
	}while(n);
	return res;
}
int main()
{
/*
	int a;
	cin >> a;
	cout << "number of digits: " << number_of_digits(a) << endl;
	return 0;
*/
}