camelCase to CONSTANT_CASE

Convert a camelCase identifier to the CONSTANT_CASE style used for Java constants: insert an underscore before each interior capital letter, then upper-case everything.

Input: one token in camelCase (letters and digits, first letter lowercase).

Output: one line — the CONSTANT_CASE form.

Example 1

Input

maxRetryCount

Output

MAX_RETRY_COUNT

1 <= length <= 60

Hint 1

For each character after the first, if it is upper-case, append '_' before it.

Hint 2

Append the upper-cased character each time.

Hint 3

Character.isUpperCase and Character.toUpperCase do the work.

This is the naming convention constants use. Walk the characters: before any capital letter that is not the first character, add an underscore; then upper-case every character as you append it.

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Input (stdin)

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