#include<stdio.h>

int main()
{
	int x0, y0;
	int x1, y1;
	int t = 0;
	scanf("%d %d", &x0, &y0);
	getchar();
	scanf("%d %d", &x1, &y1);
	getchar();
	scanf("%d", &t);
	getchar();

	int gapx = x1 - x0;
	int gapy = y1 - y0;

	int e = 0;
	int s = 0;
	int w = 0;
	int n = 0;
	
	int i = 0;
	for (i = 0; i < t; i++)
	{
		char temp = 0;
		scanf("%c", &temp);
		getchar();
		if (temp == 'E')
		{
			e++;
		}
		if (temp == 'N')
		{
			n++;
		}
		if (temp == 'S')
		{
			s--;
		}
		if (temp == 'W')
		{
			w--;
		}
	}

	if (gapx > e || gapx<w || gapy>n || gapy < s)
	{
		printf("-1");
	}
	else
	{
		printf("%d", abs(gapx) + abs(gapy));
	}
	return 0;
}