There are four friends, Soohyun, Kiyoon, Taehun, and Hwajun. Kiyoon is 207 millimeters (mm) taller than Soohyun. Taehun is 252 millimeters (mm) taller than Soohyun. Hwajun is 839 millimeters (mm) taller than Kiyoon. How many millimeters (mm) is the difference in height between Soohyun and Hwajun?
207 839 [OP_ADD]
var_a = 207
var_b = 839
var_c = var_a + var_b
print(int(var_c))