Capitalize Even-Positioned Words

You are given a sentence where words are separated by a single space. Your task is to transform the sentence such that every word at an even position (i.e., the 2^nd, 4^th, etc. word when counted from 1) is converted to uppercase, while the rest of the words remain unchanged.

For example, given the sentence "hello world this is a test", the resulting output should be "hello WORLD this IS a TEST".

The transformation should preserve the single space between words.

inputFormat

The input consists of a single line containing a sentence with words separated by a single space. The sentence may contain punctuation and is not guaranteed to end with a newline character.

outputFormat

Output the modified sentence in which every word at an even position is capitalized. Word positions are considered 1-indexed.

hello world this is a test

hello WORLD this IS a TEST