Flood Fill

def solve(image , sr, sc, color):
    tColumn=len(image[0])-1
    tRaw=len(image)-1
    st=[[sr,sc]]
    changeColor = image[sr][sc]
    if changeColor == color:
        return image
#we change the detected color first then append it to stack and look for other 
    image[sr][sc] = color
    while st:
        sr = st[-1][0]
        sc = st[-1][1]
        st.pop()
#search up
        if sr>0 and image[sr-1][sc] == changeColor   :
            image[sr-1][sc] = color
            st.append([sr-1,sc])
#search right
        if sc<tColumn and image[sr][sc+1] == changeColor:
            image[sr][sc+1] = color
            st.append([sr,sc+1])
#search down           
        if sr<tRaw and image[sr+1][sc] == changeColor :
            image[sr+1][sc] = color
            st.append([sr+1,sc])
#search left
        if sc>0 and image[sr][sc-1] == changeColor :    
            image[sr][sc-1] = color
            st.append([sr,sc-1])
    return image