#include
int main()
{
int c, i, j;
char str[1000];
i = 0;
while ((c = getchar()) != EOF) {
str[i] = c;
++i;
}
str[i] = '\0';
i = j = 0;
while (str[i] != '\0') {
putchar(str[i]);
++i;
j = i;
while (str[i] == ' ')
++i;
if (i - j >= 1)
putchar(str[j]);
}
return 0;
}