# b_str_matrix_of_4.py

# b_str_matrix_of_4.py

import string

ww = 100
hh = 100

alpha = string.letters

xy = [[] for z in range(ww*hh)]

abc = []

for x in alpha:
    for y in alpha+'0123456789':
        for z in alpha+'0123456789':
            t = x+y+z
            if not t.isalpha():
                exec(t+'=(255,255,0)')
                abc.append(t)

L = len(abc)
print L

for y in range(hh):
    for x in range(ww):
        t = y*ww+x
        xy[t] += [abc[y]]
        xy[t] += [abc[x+ww]]
        xy[t] += [abc[y+ww*2-x]]
        xy[t] += [abc[y+ww*3+x]]
0

matrix = '['+','.join(['({}+{}+{}+{})'.format(*z) for z in xy])+']'
print matrix