PROGRAMMING:Output upper triangle character array
This problem requires the preparation of procedures, output n lines from the specified lowercase English characters constitute the upper left triangle character array. If the character exceeds Z in the display process, please continue to display from back to a
###Input format:
Input a positive integer n (1 ≤ n < 7) and a lowercase English character startchar in one line.
###Output format:
Output n lines of the upper left triangle character array starting with the lowercase letter startchar. The format is shown in the output sample, where there is a space after each letter.
###Input example:
```in
4 b
```
###Output example:
```out
b c d e
f g h
i j
k
```
answer：If there is no answer, please comment
###Input format:
Input a positive integer n (1 ≤ n < 7) and a lowercase English character startchar in one line.
###Output format:
Output n lines of the upper left triangle character array starting with the lowercase letter startchar. The format is shown in the output sample, where there is a space after each letter.
###Input example:
```in
4 b
```
###Output example:
```out
b c d e
f g h
i j
k
```
answer：If there is no answer, please comment