#include <iostream>
#include <cstring>
using namespace std;
char s[100];
int main()
{
cin.getline(s,100);
int k=0,ok=0;
for(unsigned i=0;i<strlen(s);i++)
{
k++;
if(i==strlen(s)-1 or s[i+1]==' ')
{
if(k%2==0)
{
s[i-k+1]='#';
strcpy(s+i-k+2,s+i+1);
ok=1;
}
i-=k-1;
k=-1;
}
}
if(ok)
cout << s;
else
cout << "nu exista";
return 0;
}