using namespace std ;

int main()
{
string stra , strb , strc ;
cin>>stra>>strb>>strc ;

int lena , lenb , lenc ;
lena = stra.length(); lenb = strb.length() ; lenc = strc.length() ;

int found =0 , j=0 , k=0 ;

if((lena + lenb) == lenc)
{
int a,b,c ;
for(int i =0 ; i<lenc ; i++)
{
found = 0 ;
if(j<lena && found ==0)
if(strc[i] == stra[j])
{
j++ ;
found = 1;
}

if(k<lenb && found ==0)
if( strc[i] == strb[k] )
{
k++;
found = 1;
}

if(found == 0)
{
cout<<"not interlieved"<<endl;
break ;

}
}
if(found == 1)
cout<<"interlieved"<<endl;
}
else
{
cout<<"not interlieved"<<endl;
}

}