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