PROGRAMMING:Logical judgment - who did good!

A classmate in a class did a good deed without leaving his name. After the letter of praise came, the head teacher asked a, B, C, D, e and f who did the good deed
```
A: not me.
B: it's C.
C: it's d.
D: C: nonsense.
E said: either C or E
F said: neither D nor E
```
If n people are telling the truth, then based on this information, find out who may have done good.
###Input format:
Enter n, n people may be telling the truth
###Output format:
Students who are likely to do good deeds (A-F), if there are many students who are likely to do good deeds, the names of students will be output in dictionary order. Students' names are separated by "or".
If not, output "error".
###Input example:
```in
two
```
###Output example:
The corresponding output is given here. For example:
```out
A or D
```







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