소스 코드 제출

# def main(x) :
#     if a+a > 0 :
#         print(a)
#     elif a+a <0 :
#         print(-a)
#     elif a+a ==0 :
#         print(0)
#
# a = int(input())
# main(a)

# def f(x) :
#     x = 0
#     for i in range(len(a)):
#         if a[i] == k:
#             x = 1
#             print(i + 1)
#             break
#
#     if x == 0:
#         print(-1)
#
# n = int(input())
# a = list(map(int,input().split()))
# k = int(input())
# f(k)