x,n=map(int,input().split())
lst=sorted(int(input()) for _ in range(n-1))[::-1]
for i,j in enumerate(lst):
    if x>=j  :
        if(i %10 <=3) :print(str(i+1)+["st","nd","rd"][i%10]);break      
        else:print(str(i+1)+"th");break
else:
    if(n+1 %10 <=3) :print(str(n)+["st","nd","rd"][n+1%10])      
    else:print(str(n)+"th")