PROGRAMMING:Summation heboost in more complex cases
When calculating the sum of integers of a given sequence, irrelevant letters may be mixed in the sequence, which needs to be ignored when summing.
###Input format:
The input is one line, and the elements are directly separated by spaces.
###Output format:
The output is the sum of the integer parts of the sequence.
###Input example:
Here is a set of inputs. For example:
```in
1 2 3 a 4 5
```
###Output example:
The corresponding output is given here. For example:
```out
fifteen
```
answer：If there is no answer, please comment
###Input format:
The input is one line, and the elements are directly separated by spaces.
###Output format:
The output is the sum of the integer parts of the sequence.
###Input example:
Here is a set of inputs. For example:
```in
1 2 3 a 4 5
```
###Output example:
The corresponding output is given here. For example:
```out
fifteen
```
answer：If there is no answer, please comment