def check(d):
    v = [0] * 100
    for i in range(d):
        v[a[i]] += 1
    i = 0
    while __________:
        tmp = 0
        for j in range(m):
            if v[j] > 0:
                tmp += 1
        if tmp == m:
            return i
        elif i + d < n:
            v[a[i]] -= 1
            __________
        i += 1
    return -1


m = int(input())
cd = input()
dict_cd = {}
i = 0
for e in list(cd):
    if e not in dict_cd:
        dict_cd[e] = i
        i += 1
n = len(cd)
a = [dict_cd[i] for i in cd]
ans = -1
zuo = 0
for i in range(m, n + 1):
    __________
    if t != -1:
        ans = i
        zuo = t
        break
if ans == -1:
    print("没有")
else:
    print("最少花费", ans, "元, ", "区间为", zuo + 1, ",", ans + zuo)