In how many episodes was the returning champion in the lead going into Final Jeopardy? When there are ties for the lead, count them as having the lead.It must be prepared using python.

game_id	season	position	dj_score	wager	correct
5635	33	returning_champion	10000	3001	TRUE
5635	33	middle	12000	12000	FALSE
5635	33	right	13000	11001	FALSE
5634	33	returning_champion	14400	6801	TRUE
5634	33	middle	10600	10600	TRUE
5634	33	right	9400	5001	FALSE
5633	33	returning_champion	10200	8600	TRUE
5633	33	middle	3000	1000	FALSE
5633	33	right	18700	1701	TRUE
5631	33	returning_champion	10200	8500	TRUE
5631	33	middle	12400	12000	FALSE
5631	33	right	13200	12401	TRUE
5630	33	returning_champion	7400	7400	TRUE
5630	33	middle	11000	3801	FALSE
5630	33	right	7400	3600	FALSE
5629	33	returning_champion	21400	3000	TRUE
5629	33	middle	9000	7000	FALSE
5629	33	right	7800	1201	TRUE
5628	33	returning_champion	14600	5000	TRUE