s = input()
t = []
for i in range(len(s)):
    if i % 2 == 0:
        t.append(s[i])
print(''.join(t))

9b572b88041b5a9c1fa50ec535de27afb51c08ed
<mask token>

<mask token>
for i in range(len(s)):
    if i % 2 == 0:
        t.append(s[i])
print(''.join(t))

s = input()
t = []
for i in range(len(s)):
    if i % 2 == 0:
        t.append(s[i])
print(''.join(t))
