#include <iostream>
#include <sstream>
using namespace std;
 
bool ValidityCheck(const string &str)
{
    std::istringstream iss(str);
    int number;
 
    while (iss >> number) {
        if (number < 0 || number > 15) {
            return false; 
        }
    }
 
    return iss.eof();
}
 
 
int main()
{
	string buf;
	while (getline(cin, buf))
	{
		if (ValidityCheck(buf))
			cout << buf << endl;
		else
			cout << "Invalid data" << endl;
	}
 
    return 0;
}

I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8c3N0cmVhbT4KdXNpbmcgbmFtZXNwYWNlIHN0ZDsKCmJvb2wgVmFsaWRpdHlDaGVjayhjb25zdCBzdHJpbmcgJnN0cikKewogICAgc3RkOjppc3RyaW5nc3RyZWFtIGlzcyhzdHIpOwogICAgaW50IG51bWJlcjsKCiAgICB3aGlsZSAoaXNzID4+IG51bWJlcikgewogICAgICAgIGlmIChudW1iZXIgPCAwIHx8IG51bWJlciA+IDE1KSB7CiAgICAgICAgICAgIHJldHVybiBmYWxzZTsgCiAgICAgICAgfQogICAgfQoKICAgIHJldHVybiBpc3MuZW9mKCk7Cn0KCgppbnQgbWFpbigpCnsKCXN0cmluZyBidWY7Cgl3aGlsZSAoZ2V0bGluZShjaW4sIGJ1ZikpCgl7CgkJaWYgKFZhbGlkaXR5Q2hlY2soYnVmKSkKCQkJY291dCA8PCBidWYgPDwgZW5kbDsKCQllbHNlCgkJCWNvdXQgPDwgIkludmFsaWQgZGF0YSIgPDwgZW5kbDsKCX0KCiAgICByZXR1cm4gMDsKfQ==

MSAyICAKLTMgIAo1ICAKMCAgCmQgIAoxNSAgCjE2ICAKMy4xICAKdjcgIAo0ICAKOHkgIAoyICAKNyAg

1 2  
-3  
5  
0  
d  
15  
16  
3.1  
v7  
4  
8y  
2  
7