from operator import itemgetter
from collections import Counter

for _ in range(int(input())):
    n, ca, ba = map(int, input().split())
    v, b, c = itemgetter(*"VBC")(Counter(input()))
    if ca < ba:
        ca, ba = ba, ca
        c, b = b, c
    # print(v, b, c)
    r = 0
    while ca >= 2 and c > 0:
        assert ca >= ba
        ca -= 2
        c -= 1
        r += 1
        if ca < ba:
            ca, ba = ba, ca
            c, b = b, c
    while ca > 0 and ba > 0 and v > 0:
        ca -= 1
        ba -= 1
        v -= 1
        r += 1
    r += min(c, ca // 2)
    r += min(b, ba // 2)
    print(r)