import java.util.*;

public class main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        char[] chars = s.toCharArray();
        int charlonger = s.length();
        int i=0;
        int flag =0;
        int flag2=0;
        int a=0,b=-1,c=0;



        for(;i<charlonger;i++){
            if(chars[i] == 'c'){
                flag = 1;
                a=i;
            }else if(flag == 1 && chars[i] == 'w'){
                  flag = 2;

            }else if(flag == 2 && chars[i] == 'w' ){

                flag=0;
                if(i-a+1 <b || b==-1){
                    b= i-a+1;
                }

            }
            if(chars[i] =='c'&& flag2==0){
                flag2 = 1;
                c=i;
            }else if(flag2 == 1 && chars[i] == 'w'){
                flag2 = 2;

            }else if(flag2 == 2 && chars[i] == 'w' ){

                flag2=0;
                if(i-c+1 <b || b==-1){
                    b= i-c+1;
                }

            }
        }
            System.out.println(b);
    }
}