UVa 644 - Immediate Decodability

// UVa 644 - Immediate Decodability

#include <string>
#include <iostream>
#include <stdio.h>
#include <vector>
using namespace std;

int main() {
	int t = 0;
	string code;
	while (cin >> code) {
		vector<string> codes;
		while (code[0] != '9') {
			codes.push_back(code);
			cin >> code;
		}
		bool invalid = false;
		for (int i = 0; i < codes.size(); i++) {
			for (int j = i + 1; j < codes.size(); j++) {
				int l = min(codes[i].length(), codes[j].length()) - 1;
				while (l >= 0 && codes[i][l] == codes[j][l])
					l--;
				if (l < 0) {
					invalid = true;
					break;
				}
			}
			if (invalid)
				break;
		}
		t++;
		if (!invalid)
			printf("Set %d is immediately decodable\n", t);
		else
			printf("Set %d is not immediately decodable\n", t);
	}
	return 0;
}