def spiral(matrix, r, c):
    circular = []
    
    start_row, end_row = 0, r
    start_col, end_col = 0, c
    
    while start_row < end_row and start_col < end_col:
    
        for i in range(start_col, end_col):
            circular.append(matrix[start_row][i])
        start_row += 1
        
        for i in range(start_row, end_row):
            circular.append(matrix[i][end_col-1])
        end_col -= 1
        
        for i in range(end_col, start_col, -1):
            circular.append(matrix[end_row-1][i-1])
        end_row -= 1
        
        for i in range(end_row, start_row, -1):
            circular.append(matrix[i-1][start_col])
        start_col += 1
    
    return circular