import sys
input = sys.stdin.readline

def dfs(v, d):
    if S[v]!=PDCA[d]:
        return 0
        
    if d==3:
        return 1
    
    res = 0
    
    for nv in adj_list[v]:
        res += dfs(nv, d+1)
    
    return res

N, M = map(int, input().split())
S = input()
PDCA = 'PDCA'
adj_list = [[] for _ in range(N)]

for _ in range(M):
    ui, vi = map(int, input().split())
    adj_list[ui-1].append(vi-1)
    adj_list[vi-1].append(ui-1)

ans = 0
MOD = 10**9+7

for i in range(N):
    ans += dfs(i, 0)
    ans %= MOD

print(ans)