import sys

lastStr = None
curStr = sys.stdin.readline()[:-1]

resStr = ''

while (lastStr == None or curStr != lastStr) and curStr !='':
    if curStr[0].isupper() == False:
        resStr += curStr[0] + curStr[-1]
    lastStr = curStr
    curStr = sys.stdin.readline()[:-1]

print(resStr)