def equalStacks(h1, h2, h3):
    # Write your code here
    len_h1 = len(h1)
    len_h2 = len(h2)
    len_h3 = len(h3)
    
    index_counter = 0
    
    index_shifter = -1
    
    running_sum_h1 = 0
    
    running_sum_h2 = 0
    
    running_sum_h3 = 0
    
    master_dict = {}
    
    while index_counter <= max(len_h1, len_h2, len_h3):
    
        if abs(index_shifter) <= len_h1:
            running_sum_h1 += h1[index_shifter]
            if running_sum_h1 in master_dict:
                master_dict[running_sum_h1] += 1
            else:
                master_dict[running_sum_h1] = 1
            
        if abs(index_shifter) <= len_h2:
            running_sum_h2 += h2[index_shifter]
            if running_sum_h2 in master_dict:
                master_dict[running_sum_h2] += 1
            else:
                master_dict[running_sum_h2] = 1
            
        if abs(index_shifter) <= len_h3:
            running_sum_h3 += h3[index_shifter]
            if running_sum_h3 in master_dict:
                master_dict[running_sum_h3] += 1
            else:
                master_dict[running_sum_h3] = 1
            
        index_shifter -= 1
            
        index_counter += 1
        
    index_counter = 0
    
    match_list = [height for height in master_dict if master_dict[height] == 3]
    
    if not match_list:
        return 0
    else:
        return match_list[-1]