#yuki762

n,m=map(int,raw_input().split())
s=raw_input()
lc=[0]*n
ld=[0]*n
l=[]
for i in range(m):
 x,y=map(int,raw_input().split())
 x-=1
 y-=1
 if s[x]=='P' and s[y]=='D':
  ld[y]+=1
 elif s[x]=='D' and s[y]=='P':
  ld[x]+=1
 elif s[x]=='D' and s[y]=='C':
  l.append([x,y])
 elif s[x]=='C' and s[y]=='D':
  l.append([y,x])
 elif s[x]=='C' and s[y]=='A':
  lc[x]+=1
 elif s[x]=='A' and s[y]=='C':
  lc[y]+=1
res=0
for i in l:
 res+=(ld[i[0]]*lc[i[1]])
res%=10**9+7
print res