h, n = map(int,input().split())
lis = sorted([int(input()) for _ in range(n-1)] + [h], reverse=True)
for i in range(n):
    if lis[i] == h:
        v = str(i+1)[-1]
        a = "st" if v == "1" else ("nd" if v == "2" else ("rd" if v == "3" else "th"))
        print(f"{i+1}{a}")
        break