Something

String input = "I\\AM\\So\\Cool";
String output = "";

while (true) {
	int pos = input.indexOf("\\");
	if (pos == -1) {
		output = (intput + output);
		output = output.substring(0, output.length -1);
		break;
	}

	output = input.substring(0, pos) + " " + output;
	input = input.substring(pos+1);
}