How to match a random number with a number from a list

I am using a list to keep track of numbers and want to match up the lists index with a random number so I can subtract 1 from the value of that index.

import random
race_length = int(input("Choose the Length You Would Like You Race To Be 
(Between 5 and 15)"))
dice = ["1", "2", "3", "4", "5", "6" ]
cars=[
    ["1", race_length],
    ["2", race_length],
    ["3", race_length],
    ["4", race_length],
    ["5", race_length],
    ["6", race_length],
]
while race_length >0:    
    print("Press Enter to Roll the Dice")
    input()
    chosen = int(random.choice(dice))
    print(int(chosen))

What would I do so i can match the chosen match with the numbers in my list