Input Format
The first line contains . The second line contains an array   of  integers each separated by a space.
Constraints
Output Format
Print the runner-up score.

hackerrank find the runner up problem solution in python

Problem solution in python 2 programming language.

if __name__ == '__main__':
    n = int(raw_input())
    arr = map(int, raw_input().split())
    m1 = max(arr)
    m2 = -9999999999
    for i in range(n):
        if arr[i] != m1 and arr[i] > m2:
            m2 = arr[i]
    print m2

second solution

from collections import Counter
if __name__ == '__main__':
    n = int(raw_input())
    arr = Counter(map(int, raw_input().split())).keys()
    arr.sort()
    print arr[-2]

Third solution

from collections import Counter
if __name__ == '__main__':
    n = int(raw_input())
    arr = list(set(map(int, raw_input().split())))
    arr.sort()
    print arr[-2]

Problem solution in python 3 programming language.

if __name__ == '__main__':
    n = int(input())
    arr = map(intinput().split())
    arr = list(arr)
    x = max(arr)
    y = -9999999
    for i in range(0,n):
        if arr[i]<x and arr[i] > y:
            y = arr[i]
    print(y)