key=input()
word=list(input().split())
n=len(word)
l=0;r=n;
cnt=0
while l<=r:
    cnt+=1
    m=(l+r)>>1
    if key==word[m]:
        break
    elif key<word[m]:
        r=m-1
    else:
        l=m+1
if key==word[m]:
    print("Yes\n"+str(cnt))
else:
    print("No\n"+str(cnt))