#include <stdio.h>
#include <math.h>
int main(){
    //input
    char S[100+1];
    scanf("%s",S);

    //calculation
    int pos[2] = {0,0};
    for (int i = 0;i < 100+1;i++){
        if (S[i] != '\0'){
            switch (S[i]) {
                case 'N':
                    pos[0] += 0;
                    pos[1] += 1;
                    break;
                case 'S':
                    pos[0] += 0;
                    pos[1] += -1;
                    break;
                case 'E':
                    pos[0] += 1;
                    pos[1] += 0;
                    break;
                case 'W':
                    pos[0] += -1;
                    pos[1] += 0;
                    break;
            }
        }else{
            break;
        }
    }

    //output
    printf("%f\n",sqrt(pos[0]*pos[0]+pos[1]*pos[1]));
    return 0;
}