x,y=map(int,input().split())
if y<30:
    y+=30
    x+=2
    if x>=24:
        x-=24
        print("0",x,":",y,sep="")
    else:
        print(x,":",y,sep="")
elif y==30:
    x+=3
    if x>=24:
        x-=24
        print("0",x,":","00",sep="")
    else:
        print(x,":",y,sep="")
else:
    if y+30>=60:
        x+=3
        y-=30
        if x>=24:
            x-=24
            print("0",x,":",y,sep="")
        else:
            print(x,":",y,sep="")