f = open('INPUT.TXT')
s = f.readline().strip()
t = f.readline().strip()
f.close()

i = 0
j = 0

while i < len(s) and j < len(t):
    if s[i] == t[j]:
        i = i + 1
    j = j + 1

if i == len(s):
    result = "YES"
else:
    result = "NO"

f = open('OUTPUT.TXT', 'w')
f.write(result)
f.close()