#include    <iostream>
#include    <cstring>

using namespace std;

int main()
{
    char vectorCuv[100][101];
    int totalCuv = 0;

    char text[101]; // testez validez utilizez date corecte acum
    cin.getline(text, 101);

    char *cuvant = strtok(text, " ");
    while(cuvant != NULL)
    {
        strcpy(vectorCuv[totalCuv], cuvant);
        totalCuv++;

        cuvant = strtok(NULL, " ");
    }

    int inserari = 0;
    for(int i = 0; i < totalCuv - 1; i++)
    {
        char uc1 = vectorCuv[i][strlen(vectorCuv[i]) - 1];
        char uc2 = vectorCuv[i + 1][strlen(vectorCuv[i + 1]) - 1];
        if(uc1 == uc2)
        {
            for(int j = totalCuv; j > i; j--)
                strcpy(vectorCuv[j], vectorCuv[j - 1]);
            strcpy(vectorCuv[i + 1], "succes");
            totalCuv++;
            inserari++;
        }
    }

    strcpy(text, "");
    for(int i = 0; i < totalCuv - 1; i++)
    {
        strcat(text, vectorCuv[i]);
        strcat(text, " ");
    }

    if(inserari != 0)
        cout << text;
    else
        cout << "nu exista";

    return 0;
}