import std.stdio;
import std.array;
import std.algorithm;
 
string[] input = [
    "a1=a2", "b1=b2", "b3=b2", "c1=c2", "e1=e2", "a3=a4", "c3=c4", "e1=e3",
    "a2=a4", "c3=c1", "b3=a4", "c2=d1", "a4=a5", "d2=c1", "b4=b3", "d3=c3"
];
 
void main()
{
    ulong[string] g;
    string[] id;
 
    foreach (ref s; input) {
        auto h = s.split('=').map!(t => t in g ? g[t] : (id ~= t) ? g[t] = g.length : 0);
 
        ulong i = h.minElement;
        ulong j = h.maxElement;
        foreach (ref x; g) if (x == j) x = i;
    }
 
    foreach (i; g.values.sort.uniq) writeln(id.filter!(x => g[x] == i));
}

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