PROGRAMMING:Output triangle character array
This problem requires the preparation of procedures, output $$n $$line from the capital letter A to form a triangle character array.
###Input format:
Input gives a positive integer $$n $$($$1 / Le n < 7 $$) in one line.
###Output format:
Outputs an array of triangular characters starting with the capital letter a for the $$n $$line. The format is shown in the output sample, where there is a space after each letter.
###Input example:
```in
four
```
###Output example:
```out
A B C D
E F G
H I
J
```
answer：If there is no answer, please comment
###Input format:
Input gives a positive integer $$n $$($$1 / Le n < 7 $$) in one line.
###Output format:
Outputs an array of triangular characters starting with the capital letter a for the $$n $$line. The format is shown in the output sample, where there is a space after each letter.
###Input example:
```in
four
```
###Output example:
```out
A B C D
E F G
H I
J
```
answer：If there is no answer, please comment