word number show time

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

int main()
{
	int times;
	char *s;
	char *k;
	char *str = (char*)malloc(sizeof(char));
	scanf("%s", str);
	int i;
	while( *str != '\0')
	{
		if(isalpha(*str))
		{
			s = str;
		}
		else
		{
			k = str;
			times = atoi(k);
			for(i = 0 ; i < times; i++)
			{
				printf("%c", *s);
			}
		}
		*str++ =='\0';
	}
	printf("\n");
}