Yuna and her friends are of different heights. The teacher lined up in order from the smallest height, and Yuna was 4th from the front and 6th from the back. How many Yuna and her friends are there?
4 6 [OP_ADD] 1 [OP_SUB]
var_a = 4
var_b = 6
var_c = var_a + var_b
var_d = 1
var_e = var_c - var_d
print(int(var_e))