768 B | 768 chars
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
BLANK = " "
inp = input
# inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = BLANK : [*map(int,inp().split(x))]
mfi = lambda x = BLANK : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def f(k):
if 1 == len(set(str(k))):
return True
l = [*map(int, list(str(k)))]
for i in range(1, len(l)):
if l[i] > l[i - 1]:
continue
return False
return True
def solve():
n = ii()
ans = []
for i in range(n):
k = ii()
if f(k):
ans.append(k)
if len(ans) == 0:
p("NERASTA")
else:
p(min(ans))
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()