#include <algorithm>
#include <iostream>
#include <vector>
#include <iterator>
#include <iomanip>
 
int main() {
    std::vector<double> v;
    std::copy((std::istream_iterator<double>(std::cin)), std::istream_iterator<double>(), std::back_inserter(v));
    size_t columns = 4;
    size_t rows = v.size()/columns;
    for(size_t r = 0; r < rows; r++) {
       for(size_t c = 0; c < columns; c++) {
          std::cout << v[r*columns+c] << " ";
       }
       std::cout << std::endl;
    }
}
 

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20 30 40 10