#include<stdio.h>
#include<math.h>
main(){
    char S[101];
    scanf("%s",S);
    int x = 0;
    int y = 0;
    for(int i = 0;S[i] != '\0';i++){
        switch(S[i]){
           case 'N':
            y++;
            break;
           case 'E':
            x++;
            break;
           case 'S':
            y--;
            break;
           case 'W':
            x--;
            break;
        }
    }
    printf("%lf",sqrt(x*x+y*y));
}