#include <bits/stdc++.h>

#define rep(i,n) for(long long int (i)=0;(i)<(int)(n);(i)++)
#define rrep(i,a,b) for(long long int i=(a);i<(b);i++)
#define rrrep(i,a,b) for(long long int i=(a);i>=(b);i--)
#define all(v) (v).begin(), (v).end()
#define pb(q) push_back(q)
#define Abs(a,b) max(a,b)-min(a,b)
#define YES(condition) if(condition){cout << "YES" << endl;}else{cout << "NO" << endl;}
#define Yes(condition) if(condition){cout << "Yes" << endl;}else{cout << "No" << endl;}
#define Cout(x) cout<<(x)<<endl
#define POSSIBLE(condition) if(condition){cout << "POSSIBLE" << endl;}else{cout << "IMPOSSIBLE" << endl;}
#define Possible(condition) if(condition){cout << "Possible" << endl;}else{cout << "Impossible" << endl;}
#define possible(condition) if(condition){cout << "possible" << endl;}else{cout << "impossible" << endl;}
#define Size(n) (n).size()

typedef long long ll;


using namespace std;

const int INF = 1e9,MOD = 1e9 + 7,ohara=1e6;
const ll LINF = 1e18;

/*---------------------------------------------------------------
long long int kaizyo(long long int hh){
    cmp=1;
    while(hh>1){
        cmp=(cmp*hh)%MOD;
        hh--;
    }
    return cmp;
}
long long int ruizyo(long long int aa, long long int bb){
    if(aa==0){
        return 1;
    }
    else if(aa%2==0){
        long long int tt=ruizyo(aa/2,bb);
        return (tt*tt)%MOD;
    }
    else{
        return (ruizyo(aa-1,bb)*bb)%MOD;
    }
}フェルマ－のア
---------------------------------------------------------------

while(x!=0){
            sum+=x%10;
          / x/=10;
        }
        各桁の和
---------------------------------------------------------------

pair<int,int> p[100000];
cin >> tmp;
p[i]=make_pair(tmp,i);
cout << p[i].second+1 << endl;//ペアの右側つまりiを出力

---------------------------------------------------------------

bool f[100001];//1000000以下の素数を調べよう！
rrep(i,2,100001){
       f[i]=false;
    }
rrep(i,2,100001){
        if(!f[i]){
            for(int j=i+i;j<=100000;j+=i){
                f[j]=true;
            }
        }
    }
    for(int i=3;i<=100000;i+=2){
        if(!f[i]){
            c[i]++;
        }
    }

---------------------------------------------------------------

long long gcd(long long aaa,long long bbb){
    if(bbb==0){
        return aaa;
    }
    return gcd(bbb,aaa%bbb);
}
 
long long lcm(long long aaa,long long bbb){
    long long g = gcd(aaa,bbb);
    return aaa/g * bbb;
}左から最大公約数と最小公倍数


---------------------------------------------------------------

long long int prime_cnt[10000];
       for(int i=2;i*i<=n;i++){
           while(n%i==0){
               n/=i;
               prime_cnt[i]+=1;
           }
           if(n>1){
               prime_cnt[n]+=1;
               break;
           }
      }ある数nを素因数分解しましょう

---------------------------------------------------------------
debug:
cout<<"i: "<<i<<" j: "<<j<<" cnt: "<<cnt<<"\n";

---------------------------------------------------------------*/

long long int n,cnt=0,ans=0,a,b,c,d,cmp,cmpp,m,h,w,x,y,sum=0,pos;
int dy[]={1,0,-1,0};
int dx[]={0,1,0,-1};
string alph("abcdefghijklmnopqrstuvwxyz"),s;
bool fl=true;
struct edge{int to,cost;};

//-------------------------↓↓↓↓↓↓------------------------

int main(void){
       cin.tie(0);
    ios::sync_with_stdio(false);

      
       cin>>a>>b>>s;
       cmp=0;
       cmpp=0;
      rep(i,Size(s)){
          if(s[i]=='.')fl=false;
      }
      cnt=1;
      if(fl){
          rrrep(i,Size(s)-1,4){
              cmp+=(s[i]-'0')*cnt;
              cnt*=10;
          }
          if(s[3]=='-')cmp*=-1;
         cmp-=9;
         if(a+cmp<0){
             a=24+(a+cmp);
         }
         else if(a+cmp>=24){
             a=a+cmp-24;
         }
         else{
         a+=cmp;
         }
         if(a<=9)cout<<0;
         cout<<a<<':';
         if(b<=9)cout<<0;
         cout<<b<<"\n";
      }
      else{
          fl=true;
          double time,anss;
         // Cout(b);
            rrrep(i,Size(s)-1,4){
                if(s[i]!='.'){
              cmp+=(s[i]-'0')*cnt;
              cnt*=10;
                }
          }
          cmpp=cmp%10;
          cmp/=10;

          if(s[3]=='-')cmp*=-1,cmpp*=-1;

          time=(double)cmp+(double)cmpp/10;
          time-=9.0;
         time*=10;
         cmp=0;cmpp=0;
         cmp=(ll)time/10;
         time=(double)time-cmp*10;
         time=time*6;
        

         if(a+cmp<0){
             a=24+(a+cmp);
         }
         else if(a+cmp>=24){
             a=a+cmp-24;
         }
         else{
         a+=cmp;
         }

            if((double)b+time<0){
             anss=(double)60+(b+time);
             if(a-1<0){
                 a=24-1;
             }
             else{
                 a-=1;
             }
         }
         else if((double)b+time>=60){
             anss=b+time-60;
             if(a+1>=24){
                 a=0;
             }
             else{
                 a+=1;
             }
         }
         else{
         anss=b+time;
         }
         pos=(ll)anss;
        // Cout(pos);
         if(pos>=59){
              pos=b+time-60;
             if(a+1>=24){
                 a=0;
             }
             else{
                 a+=1;
             }
              if(a<=9)cout<<0;
         cout<<a<<':';
         if(pos<=9)cout<<0;
         cout<<pos<<"\n";
         return 0;
         }
         if(a<=9)cout<<0;
         cout<<a<<':';
         if(anss<=9)cout<<0;
         cout<<anss<<"\n";
      }
       
return 0;
}