<p>If any one can help me with Python code:
If I input a letter, How can I print all the words start with that word?</p>

There are many ways of doing this, e.g.:
```
```
words = ["zwei", "peanuts", "were", "walking", "down", "the", "strasse"]
letter = "w"
output = [x for x in words if x[0] == letter]
```
```
The contents of
```
output
```
will be:
```
```
['were', 'walking']
```
```
Some notes:
If the code needs to be
fast
you should put the wordlist in some kind of tree.
If you need more flexibility, you should build a regular expression for matching