https://www.codingame.com/training/easy/temperatures
import sys
import math
# 내장함수 최대한 쓰지 않는 방향의 코드로..
# Auto-generated code below aims at helping you parse
# the standard input according to the problem statement.
n = int(input()) # the number of temperatures to analyse
t_list = []
t_list_absolute = []
for i in input().split():
# t: a temperature expressed as an integer ranging from -273 to 5526
t = int(i)
t_list.append(t)
if t < 0 :
t = t * -1
t_list_absolute.append(t)
else:
t_list_absolute.append(t)
if not t_list_absolute == []: # temperature가 존재한다면
result = t_list_absolute[0]
for i in t_list_absolute:
if i < result:
result = i
if result not in t_list: #result가 음수라는 이야기
result = result * -1
else:
result = 0
# Write an answer using print
# To debug: print("Debug messages...", file=sys.stderr, flush=True)
print(result)