C++ :

#include <iostream>
#include <cmath>

using namespace std;


int main() {
	uint64_t n; cin >> n;
	int ct = 0; // 计数器
	while (n != 495) {
		int a, b, c;
		a = n % 10; n /= 10; // 分别取出各位数
		b = n % 10; n /= 10;
		c = n;
		if (a > c) swap(a, c); // 排列顺序
		if (b > c) swap(b, c);
		if (a > b) swap(a, b);
		n = (c * 100 + b * 10 + a) - (a * 100 + b * 10 + c);
		++ct;
	}
	cout << ct;
}