n, m = [ int(v) for v in input().split() ]
s = input()

mod = 1000000007

dlist= [ 0 for i in range(n) ]
clist= [ 0 for i in range(n) ]
dclist = []

for i in range(m):
    x, y = [ int(v) for v in input().split() ]
    if s[x-1] == "P" and s[y-1] == "D":
        dlist[y-1] += 1
        
    elif s[x-1] == "D" and s[y-1] == "P":
        dlist[x-1] += 1

    elif s[x-1] == "D" and s[y-1] == "C":
        dclist.append([x-1,y-1])

    elif s[x-1] == "C" and s[y-1] == "D":
        dclist.append([y-1,x-1])

    elif s[x-1] == "C" and s[y-1] == "A":
        clist[x-1] += 1

    elif s[x-1] == "A" and s[y-1] == "C":
        clist[y-1] += 1



s = 0
for i in dclist:
    s += (dlist[i[0]]*clist[i[1]]) 

ans = s % mod
print(ans)