Description

输出以下图案。

Format

Input

输入2个整数n和m，（0<n<27，0<m<100)

Output

输出n行m列的字母矩阵。

Samples

10 20

aaaaaaaaaaaaaaaaaaaa
bbbbbbbbbbbbbbbbbbbb
cccccccccccccccccccc
dddddddddddddddddddd
eeeeeeeeeeeeeeeeeeee
ffffffffffffffffffff
gggggggggggggggggggg
hhhhhhhhhhhhhhhhhhhh
iiiiiiiiiiiiiiiiiiii
jjjjjjjjjjjjjjjjjjjj