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

if c == "<":
    if s < t:
        print("YES")
    else:
        print("N0")
elif c == ">":
    if s > t:
        print("YES")
    else:
        print("N0")
elif c == "=":
    if s == t:
        print("YES")
    else:
        print("N0")