123456

#include <stdio.h>
#include <string.h>

void main()
{
	int i, max = 0, k = 0, t;
	char ten[31], s[31];
	gets_s(ten);

	while (ten[0] == ' ') for (i = 0; i < strlen(ten); i++) ten[i] = ten[i + 1];
	while (ten[strlen(ten) - 1] == ' ') ten[strlen(ten) - 1] = '\0';
	for (i = 0; i < strlen(ten); i++) if (ten[i] == ' ') while (ten[i + 1] == ' ') for (int j = i; j < strlen(ten); j++) ten[j] = ten[j + 1];
	for (i = 0; i <= strlen(ten); i++)
	{
		if (ten[i] == ' ' || ten[i] == '\0')
		{
			if (max < i - k)
			{
				max = i - k;
				strncpy(s, ten + i - max, max);
				s[max] = '\0';
			}
			k = i;
		}
	}
	printf("%d\n", max);
	puts(s);
	puts(ten);
}