alphabet = []
x = 65
while(x < 91):
    alphabet.append(chr(x))
    x = x + 1
grid = []
row = []
x = 0
while(x < 26):
    row.append("a")
    x = x + 1
x = 0
while(x < 26):
    c = 0
    while(c < 26):
        row[c] = alphabet[(c + x) % 26]
        c = c + 1
    grid.append(row)
    x = x + 1

print(grid)