PROGRAMMING:Abbreviations of phrases
Definition: the capital combination of the first letters of each word in a phrase is called the abbreviation of the phrase. Who is the abbreviation of World Health Organization.
###Input format:
The test data occupies one line and has one phrase, each phrase is composed of one or more words; Each group has no more than 10 words, and each word is composed of one or more upper or lower case letters; Words are no more than 10 in length, separated by one or more spaces.
###Output format:
Abbreviation for output regulation
###Input example:
```in
World Health Organization
```
###Output example:
```out
WHO
```
answer：If there is no answer, please comment
###Input format:
The test data occupies one line and has one phrase, each phrase is composed of one or more words; Each group has no more than 10 words, and each word is composed of one or more upper or lower case letters; Words are no more than 10 in length, separated by one or more spaces.
###Output format:
Abbreviation for output regulation
###Input example:
```in
World Health Organization
```
###Output example:
```out
WHO
```
answer：If there is no answer, please comment