T = int(input())

for _ in range(T):
    N = int(input())
    S = input()
    K = 0
    P = 0
    d = 0
    left = 0
    right = 0
    for i in range(len(S)):
        if i == 0 and S[i] != "-" or i >= 1 and S[i-1] == "-" and S[i] != "-":
            if S[i] == "K":
                left = 0
            else:
                left = 1
        if i >= 1 and S[i-1] != "-" and S[i] == "-":
            if S[i-1] == "K":
                right = 0
            else:
                right = 1
            if left == right:
                if left == 0:
                    K += 1
                else:
                    P += 1
            else:
                if d == 0:
                    K += 1
                else:
                    P += 1
                d ^= 1
    if S[-1] != "-":
        if S[-1] == "K":
            right = 0
        else:
            right = 1
    if left == right:
        if left == 0:
            K += 1
        else:
            P += 1
    else:
        if d == 0:
            K += 1
        else:
            P += 1
    if K >= P:
        print("K")
    else:
        print("P")