The ping-pong sequence counts up starting from 1 and is always either counting upor counting down. At element k, the direction switches if k is a multiple of 7 or contains the digit 7. The first 30 elements of the ping-pong sequence are listed below, with direction swapsmarked using brackets at the 7th, 14th, 17th, 21st, 27th, and 28th elements:1 2 3 4 5 6 [7] 6 5 4 3 2 1 [0] 1 2 [3] 2 1 0 [-1] 0 1 2 3 4[5] [4] 5 6Implement a function make_pingpong_tracker that returns the next value in the pingpong sequence each time it is called. In the body ofmake_pingpong_tracker, you can use assignment statements