PROGRAMMING:Conversion from lowercase to uppercase
Read an English string from the keyboard, convert it to uppercase, and then output.
###Input format:
English string, can include English characters, numbers and symbols.
###Output format:
Converted to uppercase English string.
###Input example:
```in
cvoid2020
```
###Output example:
```out
CVOID2020
```
answer：If there is no answer, please comment
###Input format:
English string, can include English characters, numbers and symbols.
###Output format:
Converted to uppercase English string.
###Input example:
```in
cvoid2020
```
###Output example:
```out
CVOID2020
```
answer：If there is no answer, please comment