def gen(cols=10, rows=20):
piece = {(0,0),(0,1),(1,0),(1,1)}
color = '#4A90E2'
cells = []
for r in range(rows):
for c in range(cols):
cells.append(f'' if (r,c) in piece else '')
return f'Tetris{"".join(cells)}
'
if __name__ == '__main__':
print(gen())