def find_square_root(target, precision):
    guess = 0
    step = 1
    
    for i in range(precision):
        step = 10 ** (-i)
        for _ in range(10):  # 各桁で0-9まで試す
            if (guess + step) ** 2 > target:
                break  # 大きくなりすぎたらこの桁の探索を終了
            guess += step
    
    return guess

print(find_square_root(9, 3))  # 2.999... (ほぼ3)