s=input()
c=input()
i=j=0
res=""
while i<len(s):
    if __________:
        i+=1
    else:
        res=res+c[j]
    __________
    if j>=len(c):
        break
if __________:
    print("是，增加了:"+res+c[j:])
else:
    print("否")