PROGRAMMING:Removes even subscript characters from a string

Delete all characters with even subscript in the string and output the remaining characters into a new string.
###Input format:
Enter a string no longer than 20.
###Output format:
After deleting even numbered characters in the string, output the remaining characters.
###Input example:
```in
Here is a set of inputs. For example:
abcdefg
```
###Output example:
```out
The corresponding output is given here. For example:
bdf
```






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