救命

#include <bits/stdc++.h>
using namespace std;
string nums[] = {"000", "001", "010", "011", "100", "101", "110", "111"};
void tNum(string &s) {
	string t;
	for (int i = 0; i < s.length(); i++) {
		int x=s[i]-'0';
		t+=nums[x];
	}
	int sum = t.length() % 4;
	if(sum != 0){
		string tmp;
		for(int i=1;i<=4-sum;i++) tmp += "0";
		t = tmp + t;
	}
	bool f = false;
	for(int i=0;i<t.length();i+=4){
		int x = 0, bs=1;
		for(int j=i+3;j>=i;j--){
			x += (t[j] - '0') * bs;
			bs *= 2;
		}
		if(x == 0 && !f){
			f = true; continue;
		}else f = true;
		if(x >= 10) cout << (char)(x - 10 +'a');
		else cout << (char)(x + '0');
	}
}
int main() {
	string s;
	cin >> s;
	tNum(s);
	return 0; 
}