9
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 6
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 4
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 6
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 3
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 4
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 10
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 6
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 4
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 2
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 5
m
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 2
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 3
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 4
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7 5 541 10 10 4 4 1 21 5 9 93 21 3
def dot1(s,t):
    l=[]
    for i in range(len(s)):
        if(i==len(s)-1):
            l.append(t+s[i]+t)
        else:
            l.append(t+s[i])
    l=''.join(l)
    return l
n=int(input())
s=[]
for i in range(n):
    s.append(input())

for i in range(len(s)):
    if(i==0):
        t=dot1(s[0],s[1])
    else:
        if((i+1)==n):
            print(t)
            break
        else:
            t=dot1(t,s[i+1])
            