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\f0\fs24 \cf0 /******************************************************************************\
\
                              Online C++ Compiler.\
               Code, Compile, Run and Debug C++ program online.\
Write your code in this editor and press "Run" button to compile and execute it.\
\
*******************************************************************************/\
\
#include <fstream>\
#include <vector>\
\
using namespace std;\
ifstream fin("sortaret.in");\
ofstream fout("sortaret.out");\
vector<int>g[100001];\
int n,  viz[100001],m;\
int sorttop[100001],cnt;\
\
void dfs(int x) \{\
    viz[x] = 1;\
    for(auto y : g[x]) \{\
        if(!viz[y])\
            dfs(y);\
    \}\
    sorttop[++cnt]= x;\
 \}\
\
int main()\
\{\
    fin >> n>>m;\
    for(int i = 1,x,y; i <= m; ++i) \{\
        fin >> x >> y;\
        g[x].push_back(y);\
    \}\
    dfs(1);\
    for(int i = cnt; i>=1; --i)\
        fout << sorttop[i] << " ";\
        \
    return 0;\
\}\
}