#include
#include
void stmun(char s[])
{
char c[4] = {'\0'};
int ch = '\0';
int i, j;
i = j = 0;
for(i=0; (ch=getchar())&&strcmp(c, "end"); i++)
{
s[i] = c[i>3 ? 3 : i] = ch;
for(j=0; i>2&&j<3; j++)
{
c[j] =c[j+1];
if(j==2)
c[j+1] = '\0';
}
}
s[i-3] = '\0';
}
int main(void)
{
char s[1000];
stmun(s);
printf("%s", s);
return 0;
}