n,k =map(int, input().split())
s=input()
a=b=i=0
cur=k
ans=0
while b != n:
    if s[b]=='b':
        if cur:
            if cur != 1:
                b += 1
            cur-=1
        else:
            while(s[a] == 'a'):
                a+=1
                ++cur
                if(a==n):
                    b=n
                    break
            a+=1
    else:
        b+=1
        ans = max(ans, b - a + 1)
    #print(a,b)

a=b=i=0
cur=k
while b != n:
    if s[b]=='a':
        if cur:
            b += 1
            cur-=1
        else:
            while(s[a] == 'b'):
                a+=1
                ++cur
                if (a == n):
                    b = n
                    break
            a+=1
    else:
        b+=1
        ans = max(ans, b - a + 1)
    print(a,b)

print(min(ans, len(s)))