The number of students in the 3rd and 5th grades combined in a school is equal to the number of students in the 4th and 6th grades combined. Find the difference between the number of students in the 5th and 6th grades when the number of students in the 3rd and 4th grades is 217 and 196, respectively.
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))