644

刷道小水题，用string做的，就是比较一个串是否是别的串的前缀

//============================================================================
// Name        : 644.cpp
// Author      : 
// Version     :
// Copyright   : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================

#include <iostream>
#include <string>
#include <algorithm>
#include <cstdio>
using namespace std;

string t, s[1000], temp;
int T, n, tag;

bool cmp(string a, string b){
	return a.length() <= b.length();
}


int main() {
	freopen("a.txt", "r", stdin);
	T = 0;
	while(cin >> t&&t!="9"){
		T++;
		n = 0;
		s[n++] = t;
		while(cin >> t&&t!="9"){
			s[n++] = t;
		}
		sort(s, s+n, cmp);
		tag = 1;
		for(int i = 0;i < n;i++){
			for(int j = i+1;j < n;j++){
				temp = s[j].substr(0,s[i].length());
				if(temp == s[i]){
					tag = 0;
					goto END;
				}
			}
		}
END:	if(tag == 1) cout << "Set " << T <<" is immediately decodable" <<endl;
		else cout << "Set " << T <<" is not immediately decodable" <<endl;
	}
	return 0;
}