You need to subtract 35 from a number, but mistakenly add it, and got 77. Find the result of the correct calculation.
77 35 [OP_SUB] 35 [OP_SUB]
var_a = 77
var_b = 35
var_c = var_a - var_b
var_d = 35
var_e = var_c - var_d
print(int(var_e))