Contest Identifier

In CodeKing contests, each contest is assigned a unique identifier that follows a specific format. Given an integer (M) such that (1 \leq M \leq 9999), the identifier is constructed by prefixing the number with 'CK' and padding it with zeroes to ensure it is 4 digits long. For example, if (M = 1), then the identifier will be 'CK0001'; if (M = 100), the identifier will be 'CK0100'. Your task is to generate the correct identifier for the given contest number.

inputFormat

The input consists of a single integer (M) ((1 \leq M \leq 9999)). This integer is provided via standard input.

outputFormat

Output the contest identifier as a string to standard output. The identifier should start with 'CK' followed by the contest number (M) padded with leading zeroes to ensure it has exactly 4 digits.## sample

1

CK0001