/in/foo.cc: In function 'int main()':
/in/foo.cc:9:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<=s.size();i++)
                 ~^~~~~~~~~~
/in/foo.cc:20:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int j=0;j<tmp.size();j++)
                ~^~~~~~~~~~~
/in/foo.cc:27:20: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    else if('a'<=tot&&tot<='z'||'A'<=tot&&tot<='Z')
            ~~~~~~~~^~~~~~~~~~