Sstrhsrtj

I have the following MWE

documentclass[runningheads]{llncs}



usepackage{algorithm}

usepackage{algorithmic}



begin{document}



begin{algorithm}[H]

caption{BLAH}

begin{algorithmic}[1]

REQUIRE $Input$

ENSURE $A$.

STATE Set $A$

end{algorithmic}

end{algorithm}



begin{algorithm}[H]

renewcommand{thealgorithm}{}

floatname{algorithm}{Not an algorithm but want the layout}

caption{BLEH} 

begin{algorithmic}[1]

REQUIRE $Input$

STATE Compute $B$

end{algorithmic}

end{algorithm}



begin{algorithm}[H]

caption{BLAH}

begin{algorithmic}[1]

REQUIRE $Input$

STATE Compute $B$

end{algorithmic}

end{algorithm}



end{document}

which produces this where the third entity is titled Algorithm 3 but I want it to be titled Algorithm 2. How do I achieve this?

EDIT I don't want to use any other algorithm environment.

Step down the counter:

documentclass{article}



usepackage{algorithm}

usepackage{algorithmic}



newcommand{altcaption}[1]{%

  addtocounter{algorithm}{-1}%

  renewcommandthealgorithm{unskip}%

  floatname{algorithm}{#1}%

  caption

}



begin{document}



begin{algorithm}[H]

caption{BLAH}

begin{algorithmic}[1]

REQUIRE $Input$

ENSURE $A$.

STATE Set $A$

end{algorithmic}

end{algorithm}



begin{algorithm}[H]

altcaption{Not an algorithm but want the layout}{BLEH} 

begin{algorithmic}[1]

REQUIRE $Input$

STATE Compute $B$

end{algorithmic}

end{algorithm}



begin{algorithm}[H]

caption{BLAH}

begin{algorithmic}[1]

REQUIRE $Input$

STATE Compute $B$

end{algorithmic}

end{algorithm}



end{document}