import std.stdio,
       std.conv,
       std.string,
       std.range,
       std.math,
       std.bigint,
       std.algorithm;

void main()
{
    auto S = readln.strip.to!(dchar[]);

    S.count!`a=='…'` == 0
        ? (-1).writeln
        : S.map!(a => (a!='…'?' ':'…').to!dchar).array.split.minPos!"a.length>b.length".front.writeln;
}