#include<stdio.h>

int main(void){

int i,total=0,count=0;
char C[14];
char c;


i=0;
for(;;){
	if((c = getchar()) != '\n'){
		C[i] = c;
		i++;
		if(i==14){
			break;
		}
	}
}

for(i=0;i<14;i++)
	printf("C[%d]=%c\n",i,C[i]);

for(i=0;i<14;i++){
	if(C[i]=='o')
		count++;
	else	count=0;
	if(total < count)
		total=count;
	continue;
}


printf("%d\n",total);

return 0;
}