Standalone Word Replacement

You are given a text string, a target word, and a replacement word. Your task is to replace every occurrence of the target word in the text provided it is a standalone word (i.e. it exactly matches and is separated from other words by whitespace) with the replacement word.

Note: If the target word appears as a substring of a larger word, it should not be replaced.

For instance, in the text:

( \text{The cat sat on the catwalk} )

only the isolated occurrence of "cat" (i.e. the word on its own) should be replaced, while "catwalk" remains unchanged.

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inputFormat

The input is provided via standard input (stdin) and consists of three lines:

• The first line contains the text string.
• The second line contains the target word.
• The third line contains the replacement word.

All strings may contain spaces.

outputFormat

Output the modified text string to standard output (stdout) after performing the replacement.

## sample

The cat sat on the catwalk
cat
dog

The dog sat on the catwalk