Hello good people I am working on a caeser cipher program for class. However, I ran into a problem with my outputs. Up to a certain point for example:

```
two('y', 'z')
```

Would give a '\x92' output instead of a 'x' output.

Currently this is my code so far:

```
def chartonum(ch):
return ord(ch) - 97
def numtochar(n):
return chr(n + 97)
def two(c1 , c2):
c1 = chartonum(c1)
c2 = chartonum(c2)
return numtochar(c1 + c2 %26)
```

I am thinking I have messed up on my mod 26, however, I am at a lost where I might have went wrong in that. Any help would be appreciated.