Yoongi had 28 flowers. Among them, 7 were given to Eunji and 9 were given to Yuna. How many flowers are left for Yoongi?
28 7 [OP_SUB] 9 [OP_SUB]
var_a = 28
var_b = 7
var_c = var_a - var_b
var_d = 9
var_e = var_c - var_d
print(int(var_e))