h,n= map(int, input().split())
l=[]
for i in range(n-1):
    l.append(int(input()))
l=sorted(l, reverse=1)

for H in l:
    if h>H:
        a=l.index(H)+1
        if a%10 == 1:
            b=str(a)+"st"
        elif a%10==2:
            b=str(a)+"nd"
        elif a%10==3:
            b=str(a)+"rd"
        else:
            b=str(a)+"th"
        print(b)
        break