# Arup Guha
# 12/9/2025
# Solution to 2025 UCF HS Online D1 Problem I/D2 Problem G: String Splitting

# Returns the reverse of s.
def rev(s):
    t = ""
    for i in range(len(s)-1,-1,-1):
        t = t + s[i]
    return t

# Get the input.
n = int(input())
s = input().strip()

# Get this out of the way.
if len(s)%2 != 0:
    print("No split can fit!")

else:

    # Split in halves.
    t = s[0:n//2]
    u = s[n//2:]

    # Check and output accordingly.
    if t == u or rev(t) == u:
        print("Happy Birthday!")
    else:
        print("No split can fit!")