Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Round | Pick | Player | Position | School |
| --- | --- | --- | --- | --- |
| 1.0 | 1.0 | Tommy Nobis | Linebacker | Texas |
| 1.0 | 16.0 | Randy Johnson | Quarterback | Texas A&I |
| 2.0 | 17.0 | Nick Rassas | Defensive Back | Notre Dame |
| 2.0 | 32.0 | Jerry Jones | Tackle | Bowling Green |
| 3.0 | 33.0 | Mike Dennis | Running Back | Mississippi |
| 3.0 | 48.0 | Phil Sheridan | Wide Receiver | Notre Dame |
| 4.0 | 49.0 | Ken Reaves | Defensive Back | Virginia State |
| 4.0 | 64.0 | Willie Asbury | Running Back | Kent State |
| 5.0 | 65.0 | Bill Wolski | Running Back | Notre Dame |
| 5.0 | 80.0 | Martin Kahn | Tackle | North Texas State |
| 6.0 | 81.0 | Charley Casey | Wide Receiver | Florida |
| 7.0 | 96.0 | William Johnson | Running Back | University of the South |
| 8.0 | 111.0 | Bill Goss | Linebacker | Tulane |
| 9.0 | 126.0 | Bob Sanders | Center | North Texas State |
| 10.0 | 141.0 | Mike Bender | Guard | Arkansas |
| 11.0 | 156.0 | Steve Sloan | Quarterback | Alabama |
| 12.0 | 171.0 | Ken Hollister | Tackle | Indiana |
| 13.0 | 186.0 | Bob Collins | Tackle | South Carolina |
| 14.0 | 201.0 | Steve Ecker | Kicker | Shippensburg |
| 15.0 | 216.0 | Tom Tolleson | Wide Receiver | Alabama |
| 16.0 | 231.0 | Jim Vining | Guard | Rice |
| 17.0 | 246.0 | Lurley Archambeau | Center | Toledo |
| 18.0 | 261.0 | Doug Korver | Center | Southern Iowa |
| 19.0 | 276.0 | Walt Mainer | Defensive Back | Xavier |
| 20.0 | 291.0 | Bob Riggle | Defensive Back | Penn State |
Question:
Which position had a pick larger than 80 and Walt Mainer as a player?
Answer:
Defensive Back