Martha in Year 5 at Hatherleigh Primary School has sent us a very well explained solution to this tricky problem. She says:

First I counted up to 122 in base 3 and base 7. Then I marked them off in fives in base 10.

Here is her working:

She goes on to say:

After that I wrote down the four numbers we were given, found out what they were in base 3 and 7, and worked out whether or not they could be made out of 7s and 3s:

22 and 41 could only be in base 7 so the other two were Zios. So:

West - Zio
East - Zept
South - Zio
North - Zept

Excellent Martha - thank you for sharing your answer with us.