s, t, c = input().split()

if c == "<":
    if s < t:
        T = 1
    else:
        T = 0
elif c == ">":
    if s > t:
        T = 1
    else:
        T = 0
elif c == "=":
    if s == t:
        T = 1
    else:
        T = 0

if T == 1:
    print("YES")
else:
    print("NO")