An elementary school has 217 3rd-grade students and 196 4th-grade students. If the number of students in grades 3 and 5 combined is equal to the number of students in grades 4 and 6 combined, what is the difference between the number of students in grades 5 and 6?
217 196 [OP_SUB] [OP_ABS]
var_a = 217
var_b = 196
var_c = var_a - var_b
var_d = abs(var_c)
print(int(var_d))