#include<bits/stdc++.h>
using namespace std;
typedef long long ll;typedef unsigned long long ull;
typedef pair<ll,ll>PLL;typedef pair<int,int>PII;typedef pair<double,double>PDD;
#define I_int ll
inline ll read(){ll x=0,f=1;char ch=getchar();while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();}return x*f;}
#define read read()
#define rep(i, a, b) for(int i=(a);i<=(b);++i)
#define dep(i, a, b) for(int i=(a);i>=(b);--i)
ll ksm(ll a,ll b,ll p){ll res=1;while(b){if(b&1)res=res*a%p;a=a*a%p;b>>=1;}return res;}
const int maxn=4e5+7,maxm=1e6+7,mod=1e9+7;
int main(){
  string s;cin>>s;
  int k=read;
  ll sum9=0;
    for(int i=1;i<=k;i++) sum9=sum9*10+9;
    ll pos=-1,pre=0,las=0;
    for(int i=0;i<s.size()-k;i++){
        if(s[i]=='.'){
            pos=i;continue;
        }
        pre=pre*10+s[i]-'0';
    }
    for(int i=s.size()-k;i<s.size();i++){
        las=las*10+s[i]-'0';
    }
    ll tmp=1;
    for(int i=pos+1;i<s.size()-k;i++) tmp=tmp*10;
    ll ans=sum9*pre+las;
    sum9=sum9*tmp;
    ll res=__gcd(ans,sum9);
    printf("%lld/%lld\n",ans/res,sum9/res);
  return 0;
}