documentclass[14pt]{extarticle}
usepackage{xstring}
usepackage{forloop}
usepackage{ifthen}
usepackage{pgfkeys}
newcommand{fios}{hellow world}
begin{document}
%StrCount{fios}{e}
%StrChar{fios}{1}
StrLen{fios}[varL]
varL

vspace{5ex}
newcounter{loop}
forloop{loop}{1}{value{loop}< varL}
{StrChar{fios}{arabic{loop}}~--
par
}
end{document}

h - 1
e - 1
l - 3
o - 2
w - 2
r - 1
d - 1