#include <stdio.h>


int main()
{
	int i, c_count, w_count;
	char S[100003];
	
	for(i=0; ;i++){
		scanf("%c",&S[i]);
		if(S[i] == 'w')
			c_count = i;
		if(S[i] == '\0'){
			w_count = i-c_count;
			break;
		}
	}
	
	if(c_count+1 > w_count)
		printf("%d",w_count);
	else
		printf("%d",c_count-1);
		
	return 0;
}