import std.functional,
       std.algorithm,
       std.container,
       std.typetuple,
       std.typecons,
       std.bigint,
       std.string,
       std.traits,
       std.array,
       std.range,
       std.stdio,
       std.conv,
       std.format;

void main()
{
foreach(i; 0..10000){
	auto ip = readln.chomp.to!int;
	if(ip == 0) break;
	else writefln("Case %s: %s", i+1, ip);
}
}
