print('<style>')
print('table, tr, th, td { border: 1px solid black; }')
print('.day_row:nth-child(7n+2) { background-color: yellow; }')
print('<style>')
print('table, tr, th, td { border: 1px solid black; }')
print('.day_row:nth-child(7n+2) { background-color: yellow; }')