PROGRAMMING:Octal to hexadecimal

Please write a program, input octal number, output the corresponding hexadecimal number.
####Input format
>Octal nonnegative integer
####Output format
>Corresponding hexadecimal nonnegative integer
Requirement: all letters in hexadecimal number are in upper case.
####Input sample
```in
eleven thousand six hundred and seventy-two
```
####Output sample
```out
13BA
```







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