What is the difference in these two codes that the system is marking me wrong? I did a print on the len of both lists and it’s the same length… ?

Mine:

```
decades = []
for age_nums in final_ages:
if age_nums == 'Unknown':
decade = 'Unknown'
decades.append(decade)
else:
age_nums = str(age_nums)
decade = age_nums[0] + '0s'
decades.append(decade)
print(decades)
```

Dataquest’s

```
decades = []
for ages in final_ages:
if ages == 'Unknown':
decade = ages
else:
decade = str(ages)
decade = decade[-1]
decade = decade + '0s'
decades.append(decade)
```

Thanks!