#include <stdio.h>
#include <stdlib.h>
#include<string.h>
int main()
{
??? char a,b,c[100000];
??? int n=0,len,i;
??? scanf("%c",&a);
??? b=a;
??? c[0]=b;
??? while(scanf("%c",&a)!=EOF)
??? {
??????? if((b!=' '||a!=' ')&&(b!='\n'||a!='\n'))
??????? {
??????????? n++;
??????????? c[n]=a;
??????? }
??????? b=a;
??? }
??? len=strlen(c);
??? for(i=0; i<len-1; i++)
??????? printf("%c",c[i]);
??? return 0;
}