import math
import sys
import fractions

sys.setrecursionlimit(2 ** 20)

# DEBUG = True
DEBUG = False
if DEBUG:
    input = open('date.in', 'r')
    output = open('date.out', 'w')
else:
    input = sys.stdin
    output = sys.stdout

S = input.readline().strip()
output.write('YES\n' if S.startswith('Yardi') else 'NO\n')

input.close()
output.close()