inp = str(input())
s = inp[0:1]
t = inp[2:3]
c = inp[4:5]

ans='NO'
if c=='<':
    if s < t:
        ans='YES'

if c=='>':
    if s > t:
        ans='YES'

if c=='=':
    if s==t:
        ans='YES'
        
print (ans)